Brother FAX-270MC Owner's manual

FACSIMILE EQUIPMENT

SERVICE MANUAL

MODEL: FAX-270MC/290MC/520DT/520MC

MFC370MC/390MC

NOTE

This Service Manual presents specifications, theory of operation, and maintenance

information which pertain exclusively to the FAX-270MC/290MC/520DT/520MC/

MFC370MC/390MC. For additional descriptions common to both FAX-270MC/

290MC/520DT/520MC/MFC370MC/390MC and FAX170/190/510/HOME FAX,

please refer to the FAX170/190/510/HOME FAX Service Manual.

CHAPTER I.

GENERAL DESCRIPTION

2. SPECIFICATIONS

Model

Color

Modem Speed

CodingMethod

TransmissionSpeed

CCITT Group

Input/OutputWidth

HoldKey

AutomaticCutter

ADFCapacity

Anti-curlSystem

RollPaperSize(Standardthermalf_ermaPLUS)

LCDSize

On-screenProgramming

MemoryCapacity

SuperRne

Smoothing

GreyScale (levels)

One-touchDialing

SpeedDialing

TelephoneIndex

SuperTelephoneIndex

Speaker Phone

Fax/TelSwitch

TADInterface

Enlargement/Reduction

EnhancedRemoteActivation

DistinctiveRinging(FAXAbility)

Next-faxReservation

Help

Caller ID (CallerDisplay)

AutomaticRedialing

AutoReduction

Multi-resolutionTransmission

Polling

DelayedTransmission

DelayedPolling

Coverpage

CallReservation

Call-backMessage

ActivityReport

AutoCNG Detection(New)

TransmissionVerificationReport

ECM

Broadcasting

QuickScanning

Out-of-paperReception

Multi Copy

Multi Transmission

PCl (Missing link)

Confidential Mailbox

Fax Forwarding

Fax-on-demand

Fax Retrieval

ICM RecordingTime 15

Memo/2-wayRecording

Page Memory Yes,

Paging

PersonalFaxMail box(5)

PersonalVoice MailBox(5)

RemoteControl

TADType

TollSaver

Voice-on-demand

FAX-270MC/290MC

Black (1395)

14400 bps

MH

9 sec.

G3

Max. 216/216 mm

Yes

10pages

Yes

98' (1" Core)

16xl

Yes

512 KB

Yes

64 by Dithered Method

5 locations

50

Yes

No

Yes

No

Yes

Yes,Simple

Yes

No

Yes

Yes (No secure polling)

Yes,3 timers

Yes

Yes, 20 pages

Yes

No

Yes

No

Yes

No

Yes

minutes

Yes

20 pages

Yes

DSPtype

Yes

MFC370MC

White (1138)

Same as left

Yes, Included

!

MFC390MC

White (1138)

Same as left

I-2

Same as left

Yes, Included w/OCR

Model

Color

Modem Speed

Coding Method

Transmission Speed

CCITT Group

Input/Output Width

Hold Key

Automatic Cutter

ADF Capacity

Anti-curl System

RollPaperSize(StandardthermalfTnermaPLUS)

LCDSize

On-screenProgramming

MemoryCapacity

SuperRne

Smoothing

Gray Scale (levels)

One-touchDialing

Speed Dialing

TelephoneIndex

SuperTelephoneIndex

Speaker Phone

Fax/TelSwitch

TAD Interface

Enlargement/Reduction

EnhancedRemoteActivation

DistinctiveRinging(FaxAbility)

Next-faxReservation

Help

Caller ID (CallerDisplay)

AutomaticRedialing

Auto Reduction

Multi-resolutionTransmission

Polling

DelayedTransmission

Delayed Polling

Coverpage

CallReservation

Call-backMessage

ActivityReport

Auto CNG Detection(New)

TransmissionVerificationReport

ECM

Broadcasting

Quick Scanning

Out-of-paperReception

MultiCopy

MultiTransmission

PCl (Missinglink)

ConfidentialMailbox

PowerFailureDialing

FaxForwarding

F_.x-on-demar_

Fax Retrieval

ICM Recording "rime

Memo/2-way Recording

Page Memory

Paging

Personal Fax Mail box (5)

Personal Voice Mail Box (5)

Remote Control

TAD Type

Toll Saver

Voice-on-demand

FAX-520DT/520MC

Black(1395)/White(1397)*

14400 bps

MH

9sec.

G3

Max.216/216

Yes

10 pages

Yes

30 m (1' Core)

16xl

Yes

512 KB

Yes

64 byDitheredMethod

5

50 locations

Yes

Yes,50 locations

Yes(onlyfor FAX-520MC)

Yes

No

Yes

Yes (onlyfor FAX-520MC)

Yes

Yes,Simple

YesforUK/NLD/SWE/NZ

Yes

No

Yes

Yes(w/secure polling)

Yes,3 timers

Yes

Yes,20 pages

Yes

No

Yes

No

Yesfor UK/BEL

Yes

No

Yes

15 minutes

Yes

Yes,20 pages

Yes

DSPtype

Yes

I-3

* FAX-520DT: Black (1395)

FAX-520MC: White (1397)

CHAPTER Ill.

THEORY OF OPERATION

I I I I I _1

I I

o., ;;:: ....

I • I _ "

Main PCB Circuit Diagram 1/5

O SW1, hook switch sensor (microswitch)

(_) SW2, cover switch sensor (microswitch)

(_) SW3, paper empty sensor (microswitch)

(_) Reset IC which turns on at the powering-on sequence and at any of the reset opera-

tions.

(_) Connector for the control panel

(_) FAX engine (ASIC) which integrates a CPU, digital portion of a MODEM and gate array

for managing the I/Os, memories, and drivers.

(_ XT2, oscillator which oscillates at 16 MHz for the CPU.

(_) XT1, oscillator which oscillates at 32.768 kHz for the calendar clock.

(_ XT3, oscillator which oscillates at 57.6 MHz for the MODEM.

_) Connector for the cutter HP sensor

III - 19

1

[

v[ _ [ ,- - I ] ;

®

_"

'""° i,.

,::: _'::

0

+i+

_4LCal

°_o .,o

I ; I ! I + _1 _ I ! I

Main PCB Circuit Diagram 2/5

(_) E2pROM (16k x I bit)

(_ ROM (256k x 8 bits. Note that the qualification machines for demonstration have a 2-

megabit ROM.)

(_) DRAM (512k x 8 bits)

Q Backup circuit for the calendar clock of the control panel and DRAM.

Ill - 20

'_ I I [ I

!,l ............

,,,

1,I

I I

Main PCB Circuit Diagram 315

® Connector for the CIS

@

®

(_)-1:

®-2:

O'3:

®-4:

Power for the ClS LED array

Clock output

Trigger signal output. One shot of this signal triggers a line of scan.

LED control signal output circuit which controls the intensity of the CIS LED ar-

ray.

Input of video data (VID) to the FAX engine

Clamp circuit that gives the bias level to the amplifier of the VlD input circuit ac-

cording to the CLAMP and CLPWM signals issued by the CPU (that monitors

the current video data input) for compensating the DC component of video sig-

nals for the next scan line

Connector for the thermal recording head

(_)-1: Power 26V for the thermal recording head

(_-2: Thermister signals which are normalized by the resistor network and fed to the

FAX engine

(_-3: Strobe signals

0-4: Data signals

_-5: Power 5V for the logic circuit of the thermal recording head

Connector for the motor

Connector for the solenoid (that switches the power transmission)

III - 21

Transistor array which consists of seven transistors

(_)-1: Transistors that control the rotation direction of the motor _._.u_uing to me MM4

through MM1 signals.

(_)-2: Transistor that turns on and off the solenoid.

The combination of the solenoid state and the motor rotation direction deter-

mines to which the motor torque should be transmitted, the cutter, the document

feeding mechanism, or the paper feeding mechanism.

(_-3: Transistor that turns on and off the CR1 relay for switching on and off the +26V

power source to the thermal recording head.

(_)-4: Transistor that turns on and off the CML relay.

(_) Document front and rear sensor circuitry that is active only while the SEON signal is on.

The LEDs for the sensors are driven by the +26V source.

(_)-1: PH1, document rear sensor

(_-2: PH2, document front sensor

! :

III - 22

J 0 J ] vt 1 1 I

"'3,.

powe R .,,_::....

.... r

I * I1 ........

_ ,,_"(_._;,...... ' ®- i::ii!,i! :.::.,

_°_ _., T

°_

Jh_,, I

J*.=

o-, I

,,,.llet

NCU

• _ I J _ L

Main PCB Circuit Diagram 415

0 Connector for the power supply PCB

O-1: CR1, recording head on/off relay

(_) 3-terminal regulator which eliminates unstabilized components of the +9V source to

generate stabilized 5V source.

(_ Connector for the NCU

(_)-1: Power for the NCU

(_)-2: Signals to the telephone

(_)-3: Signals from the telephone

(_) Analog signal selectors

(_)-1: Selects either input signals from the handset or those from the MODEM.

(_)-2: Selects either RL1 or RL2 signals inputted from the communications network.

(_)-3: Selects sound signals (e.g., alarm beeps, key clicks and ringer sounds) gener-

ated by the FAX engine, hands-free monitor signals, or voice playback signals.

(_ Analog signal selectors

(_)-1 Selects either signals gated by (_-2 or voice signals coming from the handset.

(_)-2 Selects either signals gated by (_-2 or voice playback signals.

(_-3 Selects either signals gated by (_)-2 or hands-free monitor signals.

(_) Amplifier circuit for signals outputted from the MODEM

(_) Analog front end IC which processes the analog I/O signals from/to the MODEM.

(_) Amplifier & shaper circuit for signals inputted from the communications network.

(_) Telephone circuit for transmitting signals.

III - 23

@

Speaker i:tlwlpli|iel L;ircult which _lHpIitles _,ounds Issue(] lrom the c_bovu ,_l_dlOg slgi_dl

selector (_)-3 and feeds them to the speaker.

Connector for the speaker

Speaker volume control circuit

(_)-1:VOL1 OFF

_)-2: VOL2. OFF

_)-3:VOL3 OFF

Speaker volume High

ON ON

OFF ON

Medium Low

(ON: Closed OFF: Opened)

III- 23 - 1

-- _J_ , L

.L v I ____ __

@

I I I

I t I

Main PCB Circuit Diagram 515

(_) Microphone connector

(_) Amplifier and shaper circuit for signals inputtedfrom the microphone.

(_) Analog front end IC which processes the analog I/O signals from/to the MODEM.

(_) Amplifier circuitfor signals outputted from the MODEM.

III - 23 - 2

3.3 NCU PCB

The NCU PCB switches the communications line to telephone or Ioullt-_nML)DI-M, u_+derthe

control of the main PCB.

.tl

TILIL

_LRL

P*.

T_OFF

C,

,L.

+..+ _.I,"

l¢lll

.++O--I.I.L-_c_

I,+O.--_--M_

I

:I

J

d

IJ

10

Ii

,I

7, MC: METALLIZIID POLYESTER FILMCAPACITOR

e, PC: POLYESTER FILMCAPACITOR

S. CC: CERAMICCAPACITO_

A. EC: ALUMINUMELECTROLYTIC CAPACITOR

$. COMPONENTS IN PARENTHESES NOTTO BEMOUNTED¸

2, UNLESSOTHERWISE SPECIFIEO,THE VOLTAGERESISTANCE OFCAPACITORS IS 2SVOR S0V+

1. UNLESS OTNERWIS£ SPECIFIED, POWER CONSUMP11ONOF RE_ASTORS_S1/4W

• , I , I , "1 I s I e "

NCU PCB Circuit Diagram (U.S.A. versions)

(_ Surge absorber

(_) Line relay (CML relay)

(_) Line transformer

(_) Circuit related to the line transformer

(_) High-impedance transformer circuit

(_) Calling signal detector

(_) Loop current detector

(_) Diat pu_se generator

(_) Telephone circuit

_) Reference voltage generation circuit for the operational amplifiers in (_) and (_).

@ Noise filters

Ill - 24

CHAPTER I¥.

DISASSEM BLY/REASSEMBLY

AND LUBRICATION

1.2 HUM L;over una _atle_y ASSY

(1) Insert the tip of the spring huuK a[ tile ueill.e[ ur lell. hal! ol tr_e luL;Klng arm as shown

below, then lift up the hook to release and move the ROM cover to the right.

(2) Slightly lift up the ROM cover and disconnect the battery harness from the main PCB,

then take out the ROM cover together with the battery ASSY.

(3) Remove the battery ASSY from the ROM cover.

Battery ASSY

Spdnghook ROM cover

Locking arm

Battery harness

(Hook this area.)

Main PCB

Battery connector

IV-6

(4) Io taKe out the main PUb or the power supply PCB in Section 1.18, unhook the battery

harness core and cutter HP sensor harness core from bosses "C" and "D," respectively,

at this stage.

Boss"C"

(Unhook the Dowersupply

h#rness core from here.)

Powersupplyharness

I (Rear)

Cutter HP sensor

harness

Main PCB

Motor harness

Boss_D"

(Unhook thecutterHPsensor

harness corefrom here.)

'"F" Rib "E" Resistors

Solenoid Recording

harness head harness

CIS harness

Electrolytic

capacitor

PE sensor actuator

IV-6-1

1.4 Control Panel ASSY

(1) Disconnect the main-panel harness and the main-mike harness from the main PCB,

and then take out those harnesses from the groove of the main frame.

(2) Slightly bring the control panel ASSY back up towards you so that you can release the

panel lock arm from the boss of the main frame. Pull out the panel lock arm to the left

and fully open the control panel ASSY.

Panellockarm Boss

,_, Control panel ASSY

Main-panel harness

and main-mike

harnessrouted

throughthegroove

Main-mike harness

Main-panel harness

Main-mike harness

Main-panel harness

(Main PCB)

IV - 8

(3) Push the control panel ASSY back and remove it.

Control panel ASSY

Main-mike harness

Main-panelharness

Panel lockarm

• Reassembling Notes

• Make sure that the main-panel harness and main-mike harness are routed through the

groove provided on the recording paper cover and are kept in place with the panel lock

arm, as illustrated on page IV-11.

F¢-8-1

1.5 Recording Paper Cover, Panel Rear Cover, Control Panul and Microphone

(1) Place the control panel ASSY upside down.

(2) Turn the panel lock arm until the cutout provided in it becomes aligned with the bo_ OT

the arm support, then pull it out to the left.

(3) Remove the two screws "a" from the recording paper cover and lift up the rear edge of

the cover.

(4)

(5)

(6)

(7)

Remove the ADF parts (ADF film, separator and leaf spring), using the spring hook and

a flat screwdriver. Once removed, they will become unusable and new parts should

have to be put back in.

Remove the four screws "b" from the panel rear cover, then unhook the latch "L" and lift

up the cover.

To take out the control panel PCB and the FPC key, unlock the LCD cable connector

and disconnect the LCD flat cable.

To separate the FPC key from the control panel PCB, unlock the FPC key connector

and disconnect the FPC key. . ,

Arm supped

Recording

papercover

Na.

?

Panel lock arm

ADF parts

(_. ADF film

Leaf spring _ "b"

"b"_ "'

Panelrearcover

Main-panel harness

Latch "L"

FPC key

FPC key connector

Control panel PCB

LCD cable connector

Microphone

Control panel

LCD flat cable

LCD

IV- 9

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